Date: Sat, 21 Aug 2010 20:29:05 +0200 From: Steffen Neubauer <stefreak@stefreak.de> To: freebsd-questions@freebsd.org Subject: Re: IO fluctuation Message-ID: <4C701AF1.7030304@stefreak.de> In-Reply-To: <AANLkTimNEqh6ewUuuFhgP15W=bgnSqqx=KGU8AdgArW1@mail.gmail.com> References: <4C701170.9080306@stefreak.de> <AANLkTimNEqh6ewUuuFhgP15W=bgnSqqx=KGU8AdgArW1@mail.gmail.com>
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Hello Claudiu :)
Sorry that I didn't answer these obvious questions in my first post.
Am 21.08.2010 20:16, schrieb claudiu vasadi:
> How did you setup your drives in ZFS ? stripe ?
raidz1 .... Here is my zpool status output:
# zpool status
pool: tank
state: ONLINE
scrub: none requested
config:
NAME STATE READ
WRITE CKSUM
tank ONLINE 0
0 0
raidz1 ONLINE 0
0 0
gptid/7b91a9b4-ab05-11df-8c6e-001d7d004144 ONLINE 0
0 0
gptid/7cebaf7b-ab05-11df-8c6e-001d7d004144 ONLINE 0
0 0
gptid/7e43d7a2-ab05-11df-8c6e-001d7d004144 ONLINE 0
0 0
errors: No known data errors
> what bsd version do you have and what platform ?
# uname -a
FreeBSD tank 8.1-RELEASE FreeBSD 8.1-RELEASE #0: Mon Jul 19 02:36:49 UTC
2010 root@mason.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC amd64
> Do you see this big fluctuation when copying some big file like say and iso
> or movie ?
Both, on small filesystem access and when copying big files.
When I'm listening to music with VLC over NFS it stalls regularly.
When I'm working on the shell the commands block randomly for a certain
time.
But I get that fluctuation on raw device access, too, look:
# dd if=/dev/ad0 of=/dev/zero bs=1M
^C0+0 records in
0+0 records out
0 bytes transferred in 9.848682 secs (0 bytes/sec)
# dd if=/dev/ad0 of=/dev/zero bs=1M
^C1056+0 records in
1056+0 records out
1107296256 bytes transferred in 9.492375 secs (116651130 bytes/sec)
So this is not a zfs problem. But I don't think it's the hardware, too -
I used that mainboard before FreeBSD with no problems.
And the WD EARS drives can't be the problem on raw device access, too,
because I used bs=1M, that should be enough...
This is really strange...
Greetings,
Steffen
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